1 .		Igneous rocks that contain the last minerals to crystallize from magma and consist mainly of feldspars and quartz are said to have a ____________ composition.
2 .		Fossils found in sedimentary rocks can be used to ____________.
3 .		The surface process that slowly disintegrates and decomposes rock is called ____________.
4 .		Which one of the following is NOT an agent of metamorphism?
5 .		The great majority of rocks exposed at Earth's surface are of which type?
6 .		Molten material found inside Earth is called ____________.
7 .		Why can two igneous rocks have the same minerals but different names?
8 .		The most important agent of chemical weathering is ____________.
9 .		The single most characteristic feature of sedimentary rocks are ____________.
10 .		Detrital sedimentary rocks are subdivided according to ____________.
11 .		Accumulation of silts and clays, and eventually the rocks siltstone and shale, is generally best associated with which one of the following environments?
12 .		Which one of the following is NOT a primary element found in magma?
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